Add Microsoft dependency injection extension for notion client

[KoditkarVedant]

Description

Adds Microsoft dependency injection extension for notion client
Add Notion client factory to create a new client

Fixes # (issue)
#50

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings